mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 49
mc68hc908gr16
Manufacturer Part Number
mc68hc908gr16
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GR16.pdf
(276 pages)
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3.3.2 Voltage Conversion
When the input voltage to the ADC equals V
input voltage equals V
straight-line linear conversion.
Freescale Semiconductor
INTERNAL
DATA BUS
The ADC input voltage must always be greater than V
V
Connect the V
connect the V
The V
AIEN
DDAD
INTERRUPT
LOGIC
DDAD
.
COCO
READ DDRBx
WRITE DDRBx
WRITE PTBx
READ PTBx
REFL
,
pin should be routed carefully for maximum noise immunity.
CONVERSION
BUS CLOCK
COMPLETE
the ADC converts it to $000. Input voltages between V
RESET
CGMXCLK
SSAD
DDAD
pin to the same voltage potential as the V
pin to the same voltage potential as the V
Figure 3-2. ADC Block Diagram
MC68HC908GR16 Data Sheet, Rev. 5.0
ADIV2–ADIV0
ADC DATA REGISTER
GENERATOR
DDRBx
REFH
PTBx
CLOCK
ADC
ADC CLOCK
ADICLK
, the ADC converts the signal to $3FF (full scale). If the
NOTE
VOLTAGE IN
(V
ADC
ADIN
DISABLE
)
DISABLE
SSAD
CHANNEL
SELECT
and less than
ADC CHANNEL x
SS
PTBx
DD
pin.
ADCH4–ADCH0
pin, and
REFH
Functional Description
and V
REFL
are a
49
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